I REALLY hope this is a rumor (the site is known for them, not always accurate:)
Here is a quote with blocked potential spoilers in case you want to remain totally spoiler free:
"This is how we are hearing Doctor Who Series Eight will break down. Again, nothing official, nothing released, don’t regard this as gospel. Or we’ll send Malcom Tucker round.
Fourteen episodes, split across two years.
Seven episodes, including a Christmas Special in 2014, including that two parter
First episode on April 19th. And similarly, seven episodes, including a Christmas Special in 2015.
And that is how long Peter Capaldi is locked down to play the character. Doesn’t mean he won’t extend it, of course."
I really hope it's not true. If it is, BBC just need to admit they are only doing 7 episode series of Doctor Who, now and call this Series 8 and 9. We're not stupid! LOL.